Sash-lock.



P. L. vWISSMAN.

SASH L0 APPLIUATION FILED 19, 1910.

986,33?. Patented Mar.7,1911.

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Specification of Letters Patent.

SASH-LOCK.

Patented Mar. 7, 1911.

Application filed April 19, 1910. Serial No. 556,355.

To all whom it may concern.'

Be it known that I, FREDEMGK L. VISS- MAN, a citizen of the UnitedStates, residing in the city and county of San Francisco and State ofCalifornia, have invented new and useful Improvements in Sash-Locks, ofwhich the following is a specification.

My invention relates to sash locks. Its object is to provide a simple,cheap, practical lock or fastener, which can bc easily applied toprevent the unauthorized opening of a window, by which device theopening1novement of a window may be limited; also whereby two sashes may belocked together at. a suitable point, so 'tl'at both may move in unisonin case it is desired to 'leave a slight opening for ventilation ateither top or bottom of the window, or both to) and bottom. It has otherobjects and advantages which will be apparent hereinafter.

The invention consists of the parts and the construction and combinationof parts as hereinafter more fully described and claimed, havingreference to the accompanying drawings, in which- Figure l shows theapplication of the in vention. Fig. 2 is a detail in section of thelock. F ig. 3 is a front edge view in section,

A and B represent the two sashes of an ordinary window, to which theinvention is applicable.

2 is a box or casing substantially of a quadrant form adapted to besuitably secured to one of the sashes, as A, and having in it a curvedway for the reception and guidance of a segmental latch bolt 3. Thislatch bolt 8 is concentric with the guide-way in casing 2 and isreciprocated therein by suitable means, as the handle or knob 4 carriedby the bolt and working in a slot 5 on one side of the casing. As hereshown, the back wall of the casing is contiguous to and parallel with arail of sash B, which rail is provided with one or more boxes or keepers6 arranged in the path of and engageable by bolt 3 when the latter isthrown outward in locking position, as shown in Fig. 2.

7 is a locking block or follower adapted to cooperate with the lockingbolt 3 and prevent the retraction of the same when engaged with thekeeper 6. This follower block 7 is ordinarily housed in a recess Swithin the casing 2 and adapted, when the bolt 3 is thrown forward,automatically to be projected into the space thus vacated by the bolt,by suitable means, as the spring 9.

In operation the casing is fastened to the upper edge of the lower sashand the keepers G secured to the other sash in the plane of the end ofthe bolt 3. To lock the sashes against relative movement the bolt 3 ispushed forward by the handle 4 to engage with a keeper G, the followerblock 7 springing in beneath the bolt and preventing the retraction ofthe same until the key, as l0, inserted in the casing to withdraw block7 out of the path of the bolt The latch bolt can then be pulled back andwhen pressure is released on the key, spring 9 will act to press thefollower block against: the inside of the bolt The next time the bolt 3is pushed out the follower block will spring in behind the bolt in themanner just described.

The segmental bolt is supported by the automatic space-block, whichprevents any possibility of the bolt being` picked after being locked.

rI`he lock is simple, neat. and compact. It can not be pried open whenengaged with the keepers, on account of the long` curved bearing surfacethat the box has against the top of the curved bolt. The lock beingprovided with an individual, block-operating key, can not be opened fromthe inside without the proper key.

The lock may be applied at either side of the sash and also may befastened to the center of the rail. By placing numerous sockets alongthe vertical sides of the sash, the window may be set and locked in openposition and at different positions.

In order to prevent the retraction of the locking block 7, accidentally,or except by a special key provided for the purpose, I provide thisblock 7 with a reversible sliding dog or tumbler ll which is adaptedwhen the block 7 is in forward locking position, to drop into a notch l2in the bottom of the casing A. To retract the block 7 and allow the bolt3 to bc retracted so as to unlock the window, the key must first beinserted in the keyhole 13 and then turned a quarter turn to lift up anarm 11i of the tumbler ll to raise the tumbler out of the notch l2, thenpush the key back or inwardly toward the other sash to compress thespring 9. .The block 7$is perforated from top to bottom and open at oneside so as to allow the tumbler ll to be reversed to adapt the block andsash lock to either side of a window.

Having thus described my invention, what I claim and desire to secure byLetters Patent is- 1. The combination of ,a box or casing having,` acurved guideway and a recess in the base at substantially right anglesto the said guideway and connecting` at one end therewith, the innerwall of the guideway extending past and forming` an end wall of saidrecess; a curved bolt operable in said guideway and having one end toextend across said recess and seat against the bottom thereof, and aspring-pressed follower block Operable in said recess and adapted tomove forward under the end of the bolt, when the bolt is moved towithdraw its end ont of the said recess.

2. In. a sash lock, the combination of a casing having gnideway and arecess lead ing from one end thereof, a bolt operating in the guidewayand a follower block operating` in the recess and adapted to moveautomatically and shoot forward under the end of the bolt when said boltis raised to un" cover the end of the follower block, and a tumblermember carried by the follower block and engageable with the casing tolimit the movement of said block.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing` witnesses.

FREDERICK L. VISSMAN.

IVitnesses I. CARLINI, IV. IV. DAvIDsoN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. C.

